Monthly active users: 321 million - down 9
million year-on-year but matching the forecast 321 million.

Q1 revenue guidance: Between $715 million and
$775 million. Wall Street is looking for $762.43 million.

Despite the performance, Twitter's stock slid nearly 8% in
premarket trading. As of 8 a.m. in New York, it was down 5.6%.

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Twitter's daily active users

Twitter revealed its total daily active users for the first time:
126 million. Twitter plans to switch to this user number metric
(what it calls "monetizable daily active users") exclusively
after the first quarter of 2019, and it will no longer report
monthly active users.

"Monetizable DAU are Twitter users who log in and access Twitter
on any given day through Twitter.com or our Twitter applications
that are able to show ads," Twitter said.

That 126 million figure is 60 million fewer daily users than
Snapchat, which could be part of the reason Wall Street was
spooked by Twitter's fourth-quarter earnings. But Twitter said
the number was not comparable to disclosures from other firms,
which it said "share a more expansive metric that includes people
who are not seeing ads."

Analysts have long been frustrated by Twitters refusal to reveal
its daily active users. It has only previously revealed growth
percentages. "Their excuse that they won't disclose is lame,"
Wedbush Securities' Michael
Pachter said on Twitter last year. "If they can't tell us the
numbers, why brag about growth?"

"Our efforts to improve health have delivered important results,
and new product features like a single switch to move between
latest and most relevant Tweets have been embraced by the people
who use Twitter," he said.

Twitter's costs and expenses totaled $2.6 billion in Q4, an
increase of 8% year-over-year. It expects these costs to rise 20%
in 2019 as it prioritizes "health, conversation, revenue product
and sales, and platform."